\\[-1.8ex] Soil Heterogeneity & $-$0.616$^{**}$ & $-$0.418 & $-$0.747$^{***}$ & $-$0.600$^{***}$ & $-$0.484$^{***}$ & $-$0.408$^{**}$ & $-$0.309$^{**}$ \\ 
  & (0.268) & (0.266) & (0.225) & (0.218) & (0.166) & (0.161) & (0.146) \\ 
  & & & & & & & \\ 
 Wheat Share$_{t-1}$ &  &  &  &  &  &  & $-$2.784$^{***}$ \\ 
  &  &  &  &  &  &  & (0.185) \\ 
  & & & & & & & \\ 
\\[-1.8ex] 
Oster $\delta$ for $\beta=0$ &  & 2.72 & 34.90 & 7.30 & 3.76 & 2.51 & 1.87 \\ 
Observations & 19,531 & 19,531 & 19,531 & 19,531 & 19,531 & 19,502 & 19,502 \\ 
R$^{2}$ & 0.001 & 0.369 & 0.387 & 0.393 & 0.398 & 0.401 & 0.420 \\ 
